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author | Wei Yang <richardw.yang@linux.intel.com> | 2020-04-06 20:04:12 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-07 10:43:38 -0700 |
commit | 7ca8783ad816972f0c64a189b8ba6615c6b78521 (patch) | |
tree | d4d7c3c04260d7393c866eedebfd0590f32014a5 /mm/migrate.c | |
parent | 4afdacec2e313509bf9c25f3370be299a0d60b9a (diff) | |
download | linux-stable-7ca8783ad816972f0c64a189b8ba6615c6b78521.tar.gz linux-stable-7ca8783ad816972f0c64a189b8ba6615c6b78521.tar.bz2 linux-stable-7ca8783ad816972f0c64a189b8ba6615c6b78521.zip |
mm/migrate.c: wrap do_move_pages_to_node() and store_status()
Usually, do_move_pages_to_node() and store_status() are used in
combination. We have three similar call sites.
Let's provide a wrapper for both function calls -
move_pages_and_store_status - to make the calling code easier to maintain
and fix (as noted by Yang Shi, the return value handling of
do_move_pages_to_node() has a flaw).
[david@redhat.com rephrase changelog]
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Link: http://lkml.kernel.org/r/20200214003017.25558-3-richardw.yang@linux.intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
-rw-r--r-- | mm/migrate.c | 61 |
1 files changed, 29 insertions, 32 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 20bc562f499e..6f6317903007 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1602,6 +1602,29 @@ out: return err; } +static int move_pages_and_store_status(struct mm_struct *mm, int node, + struct list_head *pagelist, int __user *status, + int start, int i, unsigned long nr_pages) +{ + int err; + + err = do_move_pages_to_node(mm, pagelist, node); + if (err) { + /* + * Positive err means the number of failed + * pages to migrate. Since we are going to + * abort and return the number of non-migrated + * pages, so need to incude the rest of the + * nr_pages that have not been attempted as + * well. + */ + if (err > 0) + err += nr_pages - i - 1; + return err; + } + return store_status(status, start, node, i - start); +} + /* * Migrate an array of page address onto an array of nodes and fill * the corresponding array of status. @@ -1645,21 +1668,8 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, current_node = node; start = i; } else if (node != current_node) { - err = do_move_pages_to_node(mm, &pagelist, current_node); - if (err) { - /* - * Positive err means the number of failed - * pages to migrate. Since we are going to - * abort and return the number of non-migrated - * pages, so need to incude the rest of the - * nr_pages that have not been attempted as - * well. - */ - if (err > 0) - err += nr_pages - i - 1; - goto out; - } - err = store_status(status, start, current_node, i - start); + err = move_pages_and_store_status(mm, current_node, + &pagelist, status, start, i, nr_pages); if (err) goto out; start = i; @@ -1688,13 +1698,8 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, if (err) goto out_flush; - err = do_move_pages_to_node(mm, &pagelist, current_node); - if (err) { - if (err > 0) - err += nr_pages - i - 1; - goto out; - } - err = store_status(status, start, current_node, i - start); + err = move_pages_and_store_status(mm, current_node, &pagelist, + status, start, i, nr_pages); if (err) goto out; current_node = NUMA_NO_NODE; @@ -1704,16 +1709,8 @@ out_flush: return err; /* Make sure we do not overwrite the existing error */ - err1 = do_move_pages_to_node(mm, &pagelist, current_node); - /* - * Don't have to report non-attempted pages here since: - * - If the above loop is done gracefully all pages have been - * attempted. - * - If the above loop is aborted it means a fatal error - * happened, should return ret. - */ - if (!err1) - err1 = store_status(status, start, current_node, i - start); + err1 = move_pages_and_store_status(mm, current_node, &pagelist, + status, start, i, nr_pages); if (err >= 0) err = err1; out: |